Answer in brief
CVE-2025-39925 records a Medium severity (CVSS 5.5) vulnerability in can: j1939: implement NETDEV_UNREGISTER notification handler. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=9d71dd0c70099914fcd063135da3c580865e924c <479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac || >=9d71dd0c70099914fcd063135da3c580865e924c <2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6 || >=9d71dd0c70099914fcd063135da3c580865e924c <76957b618ce729c3bd1e782fbc9d9991af653925 || >=9d71dd0c70099914fcd063135da3c580865e924c <4e154cb5e7681c2910e2dfa09f05e3469e333745 || >=9d71dd0c70099914fcd063135da3c580865e924c <da9e8f429139928570407e8f90559b5d46c20262 || >=9d71dd0c70099914fcd063135da3c580865e924c <7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a | 479d8a2aedcc1db16f14c1a8a9c74b5bdf18b9ac, 2c88069fac2c792e228e6a4ae71c9b9b5b9a87a6, 76957b618ce729c3bd1e782fbc9d9991af653925, 4e154cb5e7681c2910e2dfa09f05e3469e333745, da9e8f429139928570407e8f90559b5d46c20262, 7fcbe5b2c6a4b5407bf2241fdb71e0a390f6ab9a |
| Linux/Linuxgeneric | 5.4 | Not reported |
Published upstream
Oct 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 2, 2026
In the Linux kernel, the following vulnerability has been resolved: can: j1939: implement NETDEV_UNREGISTER notification handler syzbot is reporting unregister_netdevice: waiting for vcan0 to become free. Usage count = 2 problem, for j1939 protocol did not have NETDEV_UNREGISTER notification handler for undoing changes made by j1939_sk_bind(). Commit 25fe97cb7620 ("can: j1939: move j1939_priv_put() into sk_destruct callback") expects that a call to j1939_priv_put() can be unconditionally delayed until j1939_sk_sock_destruct() is called. But we need to call j1939_priv_put() against an extra ref held by j1939_sk_bind() call (as a part of undoing changes made by j1939_sk_bind()) as soon as NETDEV_UNREGISTER notification fires (i.e. before j1939_sk_sock_destruct() is called via j1939_sk_release()). Otherwise, the extra ref on "struct j1939_priv" held by j1939_sk_bind() call prevents "struct net_device" from dropping the usage count to 1; making it impossible for unregister_netdevice() to continue. [mkl: remove space in front of label]
Quoted source text, attributed separately from HOL analysis.